Craspedocephalus rubeus
Silhouette: Vijay Karthick · PhyloPic
In 3 days ~80% in a week >90%
Trimeresurus rubeus, commonly known as the ruby-eyed green pitviper, is a venomous pit viper species endemic to Southeast Asia. It occurs in southern Vietnam and eastern Cambodia. No subspecies are currently recognized. Trimeresurus rubeus inhabits seasonal tropical forests, including lightly disturbed ones. All specimens have been recorded at night in dense vegetation, often near fast-flowing streams. It is known from elevations below 500 m (1,600 ft) above sea level. Although most known populations occur in national parks, it can be threatened by habitat loss and harvesting for food and snake wine.
Images at iNaturalist Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cat Tien National Park | 🇻🇳 Vietnam |
More parks will be added in future updates.
Likely
About 40% of wildlife watchers report a Ruby-eyed Green Pitviper sighting in Cat Tien National Park on a given day, based on 55 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 10th most-seen of the 45 reptiles we can rate there. Over three days the chance rises to about 80%, and over a week to over 90%, if each day is a fresh chance.
September
In that month about 60% of wildlife watchers report a Ruby-eyed Green Pitviper in Cat Tien National Park on a given day, against under 5% in February and August, the lowest months. That is one of Cat Tien National Park's wettest months, with about 440 mm of rain against 15 mm in February.
Between 2 and 5 pm
Across all the parks we cover, that three-hour window holds the most Ruby-eyed Green Pitviper sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Cat Tien National Park, in our data
Cat Tien National Park is the only park on Wallace's Line with enough records to rate Ruby-eyed Green Pitviper sightings: about 40% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Ruby-eyed Green Pitviper is recorded against all the reptiles logged in Cat Tien National Park (55 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
